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Best answer

No, your Celebi does not show any symptoms of being a hacked Pokemon (or Hackmon as I like to call them). Here is my working out:

STATS
All of them are fine, it's base is 100 on everything. Nothing exceeds 320, and HP doesn't hit the limit either.MEMO
Looks as if it was Migerated, so it's fine that is says Hoenn instead of 'Fateful Ecounter'. Nature/arrived level is not hacked.ABILITY
Yup, Celebi has Natrual Cure.MOVES
Learns all of them via level up - totally fine.